My son stayed in one of these while he was deployed to Iraq. I've seen many of them replacing the construction trailers on industrial construction sites. I think these may be the best solution for Haiti in the short run.

As I said, my son spent a year in one in Iraq with temperatures in the summer exceeding 140°F. Even when it starts getting hot these can be great shelters. But I'm thinking about the shelters I saw riding from Cancun to Chichen Itza. There were a lot of stick houses with thatched roofs along the way there. Now, maybe with the deforestation that has taken place in Haiti there aren't the sticks available to build these shelters but these shelters should be earthquake proof or at least safer buildings to live in during both hurricanes and earthquakes than the concrete buildings built using local concrete.